vii
###FS Clock
÷
or x of
S
ample
F
requency
A division or multiple of a clock or sample frequency.
(Example: 8FS = 44.1 kHz x 8 = 352.8 kHz)
APC
A
utomatic
P
ower
C
ontrol Laser power control circuit
ASY
ASY
mmetry Control Signal The EFM signal low pass filtered and fed back to the EFM
comparator for squaring the RF signal into the EFM signal.
ATSC
A
utomatic
T
racking
S
ensitivity
C
ontrol
Detects input for automatic tracking servo gain control.
ATTM
ATT
enuate Attenuates the audio output by 12 dB.
BCK
B
it
C
locK The clock used to read the serial data.
BW
B
and
W
idth Time constant for PLL low pass filter.
C16M
C
lock
16
M
Hz Divided crystal clock.
C1F1
C
orrector
1
F
lag
1
Part of a binary number indication the degree of error correction.
C1F2
C
orrector
1
F
lag
2
Part of a binary number indication the degree of error correction.
C21O
C
lock
2
.
1
MHz
O
utput Serial audio data output bit clock.
C2F1
C
orrector
2
F
lag
1
Part of a binary number indication the degree of error correction.
C2F2
C
orrector
2
F
lag
2
Part of a binary number indication the degree of error correction.
C2FL
C2PO
C
orrector
2
FL
ag out
C
orrector
2
P
ointer
O
ut
Error corrector output indicating that data output contains errors
too large to correct and that the sample has been interpolated.
C4LR
C
lock
4
x
L
eft
R
ight Clock 176.4 kHz
C4M
C
lock
4
M
Hz Divided crystal often uses as microprocessor clock.
C864
C
lock
8
.
64
MHz PLL s VCO output at 8.64 MHz
CLTV
C
ontrol
L
oop
T
iming
V
oltage
Feedback to control the PLL gain and timing.
CLV
C
onstant
L
inear
V
elocity Maximum data density is afforded the CD format by maintaining a
constant data spacing and rate. (Changing vs. constant disc
spindle RPM).
CNIN Cou
N
t
IN
Signal used to count track jumps. (Example: during AMS search).
C OUT
C
ount
OUT
Track jump counting signal.
CRCQ
C
yclic
R
edundant
C
heck
Q
Indicates when errors have been found in the Q data.
DAO#
DA
ta
O
ut Either 16-bit serial or one of 16 parallel bits indicated by including
it’s number.
DFCT
DEFECT
The signal detected from and indicating a defect in the RF signal.
Holds last focus & tracking errors.
DIRC
DIR
ect
C
ontrol Used by system control to cause a one-track jump.
DOTX
D
igital
O
u
T
for e
X
ternal Serial data for direct (external) digital output from player.
EFM
E
ight to
F
ourteen
M
odulation
The data modulation scheme used to increase data density. Also
use to identify the RF data signal after it has been squared.
EMPH
EMPH
asis The signal indicating the audio was pre-emphasized.
ESP
E
lectronic
S
hock
P
rotection Playback at double speed using pause and a buffer RAM to
provide continuous playback data during mechanical disturbances.
EXCK
EX
ternal
C
loc
K
The SBSO contains one of the P thru W data words relative to
this external clock input.
FE Focus Error The difference signal of (A+C) - (B+D) main spot detectors.
FFDR
FFON
FRDR
FRON
F
ocus
F
orward
DR
ive
F
ocus
F
orward
ON
F
ocus
R
everse
DR
ive
F
ocus
R
everse
ON
Focus coil drive error signal.
FGD
F
ocus
G
ain
D
own Filter circuit to reduce focus gain with internal switching.
FILI FILO
FIL
ter
I
n or
O
ut Input/output for a low pass filter.
FLB
F
ocus
L
ow
B
andwidth Used to set low frequency response of focus servo.
FLGL
FL
a
G
L
eft or
R
ight Identifies data for left & right channel audio.
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